So my question is, is George Lucas still getting paid for new Star Wars movies and TV shows done by Disney?
Paid? Maybe. But he doesn't need to, and contracts with Disney have NDA that will most probably forbid us from knowing (as for the shares after he sold to Disney). As, in the 70's, George Lucas chose himself opted for future merchandising rights over a raise in salary1, he knows where to get the money from. So, no direct money, but he's definately getting money, and BIG money2.
Over these past 5 decades, George Lucas and Lucasfilm have been protecting their intellectual property rights. Copyright (2500+), Trade Marks (1,000+), Patents and Designs, they own over thousands of rights. He gets money anytime someone wants to use a name or technology they created and protected. And they enforce them anytime it's needed. They even sued some politics/groups/companies because they used the tag "Star Wars" (and here) or any other word he owns rights upon. Sometimes, they don't win though...
1. 2. and others : The sources are Fieldfisher -- Suiter -- Lucasfilm vs Ainsworth -- The force is strong with Star Wars intellectual property